<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /*浪潮之巅 */
        /* margin重合的问题 */
    .one{
         width:100px;
         height: 100px;
         background: salmon;

         margin-bottom: 150px;
    }
    .two{
        margin-top: 100px;
        width: 100px;
        height: 100px;
        background: skyblue;
    }
    </style>

</head>
<body>
    <div class="one"></div>
    <div class="two"></div>
</body>
</html>